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OI-codes/Luogu/P1258/P1258.cpp

11 lines
229 B
C++

#include <bits/stdc++.h>
using namespace std;
int main() {
double s, a, b;
scanf("%lf%lf%lf", &s, &a, &b);
printf("%.6lf\n", ((b + a) * s / (b + 3 * a)) / b + (s - ((b + a) * s / (b + 3 * a))) / a);
return 0;
}